It’s a reminder that even though Canada enters a brave new world of cannabis legalization on Wednesday, these heady horizons do not necessarily extend beyond the country’s borders. So Canadians should be aware of the rules when travelling abroad once Ottawa allows recreational marijuana use at home.

Here’s what you need to know:

1. Legalization

As of Oct. 17, adults in Canada can possess and share up to 30 grams of legal cannabis. They’ll be able to buy it from provincially or federally licensed retailers and grow up to four cannabis plants per residence for personal use.

2. Cannabis to go?

Leave your freshly procured weed at home. The federal government warns that taking pot in any form across Canada’s international borders will remain illegal and can result in serious criminal penalties